ol
{
    padding: 0px;
    display: inline-block;
    border: solid 2px;
}

.left
{
    width: 8%;
}

.left li
{
    display: block;
    width: 100.1%;
    margin-left: 0px;
    cursor: pointer;
    background: rgba(111, 111, 111, .3);
}

.left li:hover
{
    background-color: #1890ff;
}

#content
{
    width: 800px;
}

#content #title
{
    font-weight: bolder;
}